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PSoC™ 4

ThBi_3905606
Level 2
10 replies posted 10 questions asked 10 sign-ins
Level 2

I cannot find any information about solder mask for the touch sensor layout

I made my own touch sensor, without solder mask, so my touch aera is the copper pad.

I know I have to use an overlay, like 1mm acrylic, but I'd like to know if there is an electrical difference between touch sensor with solder mask or without solder mask

What is the best pratice

Thomas

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VenkataD_41
Moderator
Moderator 750 replies posted 500 replies posted 250 solutions authored
Moderator

Hi Thomas,

There would not be much electrical difference with and without solder mask if the overlay is present.

The solder mask prevents the accidental touch of the sensors in case when the overlay is not present.

Only thing you have to ensure is that there should not be any air gap present in between the sensors and the overlay.

We recommend you to keep solder mask because if there is any possibility for any liquid to reach the sensors through the airgaps present in the overlay.

Thanks

Ganesh

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VenkataD_41
Moderator
Moderator 750 replies posted 500 replies posted 250 solutions authored
Moderator

Hi Thomas,

There would not be much electrical difference with and without solder mask if the overlay is present.

The solder mask prevents the accidental touch of the sensors in case when the overlay is not present.

Only thing you have to ensure is that there should not be any air gap present in between the sensors and the overlay.

We recommend you to keep solder mask because if there is any possibility for any liquid to reach the sensors through the airgaps present in the overlay.

Thanks

Ganesh

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